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                                                                                   An Airbus A380 under construction The world's largest passenger plane may not be sky-worthy, some aircraft engineers in Australia are saying. The BBC  reports  that the engineers are concerned about small cracks that have appeared on the wing ribs of some  Airbus A380  airplanes, and that they're calling for the whole fleet to be grounded for investigation. The cracks were found on A380s operated by Singapore Airlines and Qantas Airways, the BBC reports, and Singapore Airlines says it has repaired the wings of two of its A380s. Airbus  recommends that airlines check for cracks but says they present no real danger. The BBC quotes the following from a stat...